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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For questions relating to quantum chemistry using wavefunction-based methods and solving the Schrödinger equation.
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a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – gas, liquid or solid material.
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should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair …
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Adhesion refers to the attractive forces that exist between two materials. Questions that are based on these attraction forces, e.g: surface tension, contact angle, capillary rise, should use this tag…
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The adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface.
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For questions about saturated and unsaturated alcohols, their physical properties, their reactions, etc. For questions about phenol, use the [phenols] tag instead.
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should be applied to questions about mechanisms, selectivity, or other aspects of aldol reactions.
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For questions about the alkali metals (group 1), their compounds, and their physical and chemical properties. For questions specifically about hydrogen, use tag [hydrogen] instead.
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For questions about the alkaline earth metals (group 2), their compounds, and their physical and chemical properties.
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Different forms of an element which exist in the same state but have different molecular or crystalline structures. Classic examples of allotropes include diamond and graphite (allotropes of carbon), …
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For questions about alloys.
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For questions about amines - organic compounds with a basic nitrogen with a lone pair, also occasionally referred to as derivatives of ammonia. Not to be confused with amides, for which the tag [carbo…
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for questions about amino acids, both natural and non-natural ones. It should only be applied to questions about the monomers. For peptides and proteins, use the proteins tag instead.
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The branch of chemistry concerned with identifying and quantifying the chemical constituents of matter.
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Chemical processes and theories being used in practical and experimental applications.
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For questions relating to compounds dissolved in water and resulting reactions.
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For questions about the properties and reactions of aromatic compounds. This tag should also be applied to antiaromatic compounds. This tag should not be applied to general questions about resonance, …
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For questions about the concept of aromaticity. Do not use for reactions of aromatic compounds.
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Chemistry occurring on asteroids, comets, in the interstellar medium or on other planets.
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Chemical reactions that occur in the atmosphere of Earth and other planets. Relevant reactions include both those that take place only in the gas-phase, in the solid or liquid phases of aerosols or a…
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For questions about the atomic radius - a measure of the size of an atom, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding "cloud" of electrons.
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For questions about the various atomic structure theories, including the Bohr theory. Not to be confused with the actual arrangement of atoms in macroscopic solids ([solid-state-chemistry]) or newer q…
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Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be…
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A set of (basis) functions make up a basis set. These functions (generally) represent atomic orbitals whose linear combinations are used to make molecular orbitals (LCAO-MO) in computational chemistr…
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Also known as banana bond. These kinds of bonds are usually found in small, strained, organic molecules. The simplification of the hybridisation scheme fails for this class of compounds.
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for questions concerning biochemical methods (e.g. electrophoresis) or those concerning biochemical mechanisms or research. Do not use this tag if your question is merely about compounds o…
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the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid
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For questions about chemical bonds (ionic/covalent/etc.), their properties (length, energy, angle, etc.) or their relation to other molecular properties (intermolecular forces/dipole moment/etc.). Do …
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about scientific books, and/or scientific literature in general. Maybe especially useful in combination with reference-request or textbook-erratum.